Apparatus for forming water heating coils



May 12, 1942.

w. L. ENGHACJSER 2,282,542 APPARATUS FOR FORMING WATER HEATING COILS Filed Dec. 5, 1938 3 Sheets-Sheet l INVENTOR.

ATTORNEY.

May 12, 1942. w. 1.. ENGHAUSER APPARATUS FOR FORMING WATER HEATING COILS Filed Dec. 5, 1938 5 Sheets Sheet 2 INVENTOR.

MTTORNEYS y 1942- w. L. ENGHAUSER APPARATUS FOR FORMING WATER HEATING COILS Filed Dec. 5, 1938 a Sheets-Sheet s BY W 7 INVENTOR.

WMATTORNEYE Patented May 12, 1942 APPARATUS FOR FORNIING WATER HEATING COILS Winford L. Enghauser, Cincinnati, Ohio, assignor to The Production Plating Works, Inc., Lebanon, Ohio, a corporation of Ohio' Application December 5, 1938, Serial No. 243,908

Claims.

This invention relates to the art of bend-.

ing or forming lengths of tubing and is particularly directed to apparatus for bending a length of pipe into the form suitable for a water coil, specifically providing a reversely bent length of tubing having parallel runs and adjacent terminal ends. It is desirable to extend the amount of passageway so that the water has a greater travel in the zone of heat. For this reason, the tube is bent so as to provide an enlarged or flared bight.

The formation of a coil of this shape presents unusual problems in the art of bending. One of the first considerations is reduction in the number of steps required in the formation. The coil must sell inexpensively and it is therefore desirable that the number of steps be reduced to a minimum to save costs of production. Also the tubing must be supported efficiently during the bending so as to prevent wall collapse.

It has been the object of the present inventor to provide an apparatus for bending a length of tubing into a complete coil in a single operation or pass. tive, may consist of a throated die, including a A structure, resulting from this objecrocking die actuated by the motion of a descending forming die as it passes into the throat of the lower die for bending the pipe around the forming element of the descending die to form the enlarged bight and for disposing the runs in close proximity.

It has been a further object of the inventor to facilitate the removal of the finished coil from the apparatus. Toward this end,'the equipment includes a release mechanism whereby the forming parts may be moved a predetermined amount to permit the withdrawal of the finished coil.

It has also been an object of the inventor to provide an apparatus of this characterwhich is rugged and accurate in the production of the article, which adequately supports the tubing,

and wherein the forming parts may be interchanged to produce coils formed of pipe'of different diameters.

The method described herein forms the subject matter of a divisional application, Serial No.

304,984, filed November 17, 1939.

Other objects and certain advantages will be more fully apparent in -a description of the accompanying drawings in which:

Figure 1 is the front view of the coil forming apparatus of this invention. v Figure 2 is a fragmentary view taken similar to Figure l but showing the apparatus in position after forming the length of tubing into a coil.

Figure 3 is a side view of the apparatus. Figure 4 is an enlarged sectional view taken on line 44, Figure 1, illustrating the details of the top die.

Figure 5 is an enlarged fragmentary view of a portion of Figure 3, further detailing the die.

' Figure dis a view taken similar to Figure 5,

but showing the release mechanism thereof operated for removing the finished coil.

Figure 7 is a sectional view taken on line 1l Figure 5, further detailing the release mechanism.

Figure 8 is a sectional view taken on line 88, Figure 1, detailing a portion of the lower die.

Generally described, the apparatus consists cl a stationary die having a rocking die pivoted thereon, and an upper die adapted to descend upon the pipe for forcing the pipe between the of which rests on the top surface ofthe die sup- I port. This die element is removable'for interchangement. A separate die element for each size of tubing is employed. A semi-circular groove l4, formed on the radius of the particular tubing, extends along the top arm and the side arm of the die and feathersout atthe base of the vertical arm. I

A bracket 15, for supporting the length of the pipe, is fixed against the side of the support and provides a horizontal arm, the top surface of which lies in the plane of the-base of the semicircular groove M. .This'arm has a stop It adjustably fixed thereon by means of a set screw The length of tubing, indicated at I8, has one end engaged against this stop Hi.

The rocking die I9 is constituted by a bell crank, which is pivoted on a pivot pin 20. One arm of the bell crank extends upwardly and carries a forming wheel 2l,.which includes a semicircular groove 22, formed on the radius of the particular tubing, wherein the wheel is in the form of a sheave. When this wheel is in upward position, the straight length of pipe will rest tangentially in the groove since the base of the groove is in the same plane as the base of the groove of the stationary die.

The horizontal arm'of the bell crank carries an actuating wheel 23. This wheel is grooved in the same manner as the wheel2 i. posed directly in the path'of the descending die or, more specifically, the pipe pressed downwardly under the die. The bell crank is held in the position as described above by means of a coil spring 24 under tension between a pin 25 on the Vertical arm and a pin 26 fixed on a stop element .21 attached to the side-of the support ll. The bell crank carries a stop 28 engaged with stop 21 The wheel is dis- .to its axis. and 2 the :wheel *sections: are z=loosely mountedron thereof.

scent ofthe upper die.

The details of the die actuating mechanism are not shown since they are conventional. The

lower end of the ram 29 includes an attachment when the rocking die is in position prior to dedie. adapted to engage the tubinasaidbell crank having one of its anns extended laterally into the throat and engageable by the descending tubing for causing the first named forming wheel to bend the tubing around the descending form- "ingwheel'and'to' move one run of tubing close is of the same type as the wheel 2| but.is, .split centrally of its thickness, thatis, at right angles Theastudeiszifixedrrigidly imposition the stud.

The outer asection s36 .oftrthe .wvheel istshiftable -along the studzbyrmeanspf-xa". lever*'3l. The "handle 38 of the lever is screwed into one arm:of*a bell crank 39, :"which is lzbifurcated land :pivoted on.the 'outer end of theistudz35 om arpin 40. "The other arm of thetfbellrcrankisxconnectedto the wheel by. means :of. a1 link-.4 I. :For 'this'purpose,

the wheel section :36 includessspaced ears :ex-

tending longitudinallyaof the -:;stud at each-t side The link; elements: 4 If in -=each"instance, are attached to the inner side of the ears 42 pivotal connection since they are'screwed into the ears and loosely:engagethelinks The same arrangement is: provided for :attaching' the links to the bifurcated arm of thebell'crank, the screw,

in this instanceybeing indicated at 44.

Thus, when-therpivotw and the screws 43 and are alignedxalong the-axis of the stud,

the sections of'the awheel are held together as indicated inFig'ure 5. Inrthis position, inward The ram is held in spaced relation with're- 'spect to the stationary die rand against any spreading tendency'by means ofa roller 50 "carried by 'an arm fixed to the'carrier for'the upouter surface of a'guide'bar 52fixed vertically totherear face ofthelbase II.

An adjustablestop 55 isfixedto the ram and includes a wheel '56 appropriately grooved and by means of "screws '43. The screws afiord a --movement of the lever. 3l is limited by means of ta setxscrew'lfi traversing'a cross. pieced! of the -bell crank lever andh'eld iniposition by means of :a nut 48 wherebyzthe set screw will engage :the stud (see Figure 7) when thewheel is ready *for the "forming operations.

per forming wheel. This-roller rides'along theadapted to'be engaged by the run of tubing when s'the ram reaches'thelower end of its-stroke for 'maintaining' thefformed'run in strictly vertical position (see 1Figure..2)

When the forming wheelis in'the position shown in Figure 6,"the;finished'coil may be slid downwardly, assuminggof course, that the ram has been raised. The runs '51 of the coil are spaced sufiiciently to permit traversal with respect to the stud '35.

Having described my invention, I. claim:

1. 'An apparatus for? forming a length of tubing. into a reverselysbent 'element,- comprising; a base including a throatya support disposed horizontallyiat one'side of the first named supside opposite to the support, one arm of said bell crank extending Y upwardly, a forming .wheel port, a bell crank pivoted on the-support at the to 'the other, and means for spreading the descending forming wheel to permit removal of the;formed element.

L.2..An apparatusl'for forming a length of tubing into a reversely bent element, comprising; a support including a throat, a bell crank pivoted -.0n.the support at one side of the throat, one arm of said bellcrank extending upwardly,

'-a :forming wheel mounted thereon, 'a forming wheel adapted to :be'moved into the throat, said .bell crank "havingroner or its arms extended; into the throat and engageableby' the descending tubiingffor icansing the first: named "forming wheel to bendrt'he tubing :a'roun'dithedescending'formping wheel.

"3. 'Anapparatus for forming a length'of'tubing into'a reversely bent element, comprising; a' supportincluding a throat, a. bell crank pivote'd'on the support at the side opposite to the second "named support, one arm of said bell crank'exitending upwardly, a grooved forming "wheel mounted thereon and disposed in the same'plane as the'topof the support, a grooved forming wheel adapted to enter the throat and engage the tubing, saidbell crank having one of its arms extended laterally into the throat,-an actuating wheel on-said arm engageable by the descending tubing for causing the first named forming wheel to bend the tubing around the descending forming wheel and to move the one'run of pipe-close to the other,"and means'for spreading'the descending forming wheel to permit re- .moval or the formed article.

' 4.In a pipe bending apparatus, a support for the pipe including a throat, a forming die adapted todescend intosaidthroat and including ,a

grooved forming wheel for direct engagementwith the pipe, guide means for holding the'forming wheel toward one side wall of thethroat, ,a bell crank having onearm engaged as the forming wheel descends andthe other arm 'carryinga grooved forming wheel for bending the pipe aroundthe first'named'forming wheel whereby the bend of the pipe is greater than degrees, means for normally holding'the bellorank with the last named forming wheel clear'of thethroat and, means disposed-on the die for controlling the spacing and maintaining the parallelism of the runs of pipe.

5. A pipe bending apparatusadapted to bend a length of tubing into a reversely bent form, c0mprising a support including. a throat, a bell crank pivoted on the support at one side of the throat, one arm of said-bell crank extending upward- 1y, a forming discmountedon the upperend 01' said arm and disposed in the plane of thetop of the support for providing .a supporting surface for the lengthoftubing, a, forming.means adapted to descend into .the throat, includingua circular forming disc on its lower end, said bell crank including an arm extending laterally-into the throat and adapted tobe engaged. asthe forming disc descends, for causing the first-named forming'disc to bend the tubing around thedescending forming disc.

WINFORD ,L. ENGHAUSER. 

